残余应力
选择性激光熔化
材料科学
可制造性设计
激光器
激光扫描
复合材料
可靠性(半导体)
各向异性
热的
机械工程
压力(语言学)
残余物
计算机科学
光学
微观结构
工程类
物理
哲学
气象学
量子力学
功率(物理)
语言学
算法
作者
L. Parry,Ian Ashcroft,Ricky Wildman
标识
DOI:10.1016/j.addma.2016.05.014
摘要
Selective laser melting (SLM) is an attractive technology, enabling the manufacture of customised, complex metallic designs, with minimal wastage. However, uptake by industry is currently impeded by several technical barriers, such as the control of residual stress, which have a detrimental effect on the manufacturability and integrity of a component. Indirectly, these impose severe design restrictions and reduce the reliability of components, driving up costs. This paper uses a thermo-mechanical model to better understand the effect of laser scan strategy on the generation of residual stress in SLM. A complex interaction between transient thermal history and the build-up of residual stress has been observed in the two laser scan strategies investigated. The temperature gradient mechanism was discovered for the creation of residual stress. The greatest stress component was found to develop parallel to the scan vectors, creating an anisotropic stress distribution in the part. The stress distribution varied between laser scan strategies and the cause has been determined by observing the thermal history during scanning. Using this, proposals are suggested for designing laser scan strategies used in SLM.
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